Flash lens and flash module employing the same

ABSTRACT

A flash lens and a flash module employing the same. The flash lens includes a lens unit including an incident surface, a reflecting surface, and a light-emitting surface; and a lens seating portion disposed at a lower portion of an edge of the light-emitting surface, extending and protruding from the reflecting surface, and including a pattern formed in a lower surface thereof. In addition, the flash module according to an embodiment of the present invention may include the flash lens and a light emitting diode (LED) chip integrally formed with the flash lens.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No.10-2010-0111564, filed on Nov. 10, 2010, in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein in itsentirety by reference.

BACKGROUND

1. Field

The present disclosure relates to a flash lens and a flash moduleemploying the same, and more particularly, to a flash lens in which apattern is formed in a lens seating portion in order to reduce a loss oflight in the flash lens, and a flash module employing the flash lens.

2. Description of the Related Art

Camera flashes are apparatuses used to provide light when an amount oflight is not sufficient during photographing or when an auxiliary lightsource is necessary. A camera flash may include a light source unit anda lens unit. The light source unit may use xenon or a light-emittingdiode (LED), and the lens unit may use plastic or glass. Recently, mostsmall electronic apparatuses may have a small camera embedded therein,and such a small camera needs a flash in order to provide a sufficientamount of light during photographing. The flash needs to be made thinnerin order to be embedded in the small electronic apparatus. Thus, inorder for such a thin flash to effectively provide a sufficient amountof light to an image capture area, research on a flash lens is activelybeing conducted.

SUMMARY

Provided is a flash lens in which a pattern is formed in a lens seatingportion in order to reduce a loss of light in the flash lens, and aflash module employing the flash lens.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

According to an aspect of the present invention, a flash lens includes alens unit including an incident surface, a reflecting surface, and alight-emitting surface; and a lens seating portion disposed at a lowerportion of an edge of the light-emitting surface, extending andprotruding from the reflecting surface, and including a pattern formedin a lower surface thereof.

The pattern has a plurality of basic shapes repeatedly formed.

The pattern reflects light incident on the lens seating portion towardthe light-emitting surface.

The lens seating portion has any one shape selected from the groupconsisting of a rectangular shape, a square shape, a circular shape, andan oval shape.

A cross section of the basic shape has any one shape selected from thegroup consisting of a triangular shape and a semicircular shape.

The plurality of basic shapes have the same size.

As the distance between the basic shape and the reflecting surfaceincreases, the basic shape becomes larger.

According to another aspect of the present invention, a flash moduleincluding: the flash lens; and a light emitting diode (LED) chipintegrally formed with the flash lens.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings of which:

FIG. 1A is a schematic cross-sectional view illustrating a flash lensaccording to an embodiment of the present invention, and FIG. 1B is aplane view thereof;

FIG. 2A is a schematic cross-sectional view illustrating a flash lensaccording to another embodiment of the present invention, and FIG. 2B isa plane view thereof;

FIG. 3A is a schematic cross-sectional view illustrating a flash lensaccording to another embodiment of the present invention, and FIG. 3B isa plane view thereof;

FIG. 4A is a schematic cross-sectional view illustrating a flash lensaccording to another embodiment of the present invention, and FIG. 4B isa plane view thereof;

FIGS. 5A and 5B are charts illustrating illuminance of a flash lensaccording to an embodiment of the present invention; and

FIG. 6 is a schematic cross-sectional view illustrating a flash moduleaccording to an embodiment of the present invention.

DETAILED DESCRIPTION

Various example embodiments will now be described more fully withreference to the accompanying drawings in which some example embodimentsare shown.

Detailed illustrative example embodiments are disclosed herein. However,specific structural and functional details disclosed herein are merelyrepresentative for purposes of describing example embodiments. Thisinvention may, however, may be embodied in many alternate forms andshould not be construed as limited to only the example embodiments setforth herein.

Accordingly, while example embodiments are capable of variousmodifications and alternative forms, embodiments thereof are shown byway of example in the drawings and will herein be described in detail.It should be understood, however, that there is no intent to limitexample embodiments to the particular forms disclosed, but on thecontrary, example embodiments are to cover all modifications,equivalents, and alternatives falling within the scope of the invention.Like numbers refer to like elements throughout the description of thefigures.

It will be understood that, although the terms ‘first’, ‘second’, etc.may be used herein to describe various elements, these elements shouldnot be limited by these terms. These terms are only used to distinguishone element from another. For example, a first element could be termed asecond element, and, similarly, a second element could be termed a firstelement, without departing from the scope of example embodiments. Asused herein, the term “and/or,” includes any and all combinations of oneor more of the associated listed items.

It will be understood that when an element or layer is referred to asbeing “formed on,” another element or layer, it can be directly orindirectly formed on the other element or layer. That is, for example,intervening elements or layers may be present. In contrast, when anelement or layer is referred to as being “directly formed on,” toanother element, there are no intervening elements or layers present.Other words used to describe the relationship between elements or layersshould be interpreted in a like fashion (e.g., “between,” versus“directly between,” “adjacent,” versus “directly adjacent,” etc.).

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of exampleembodiments. As used herein, the singular forms “a,” “an,” and “the,”are intended to include the plural forms as well, unless the contextclearly indicates otherwise. It will be further understood that theterms “comprises,” “comprising,” “includes,” and/or “including,” whenused herein, specify the presence of stated features, integers, steps,operations, elements, and/or components, but do not preclude thepresence or addition of one or more other features, integers, steps,operations, elements, components, and/or groups thereof.

In the drawings, the thicknesses of layers and regions are exaggeratedfor clarity. Like reference numerals in the drawings denote likeelements.

FIG. 1A is a schematic cross-sectional view illustrating a flash lens100, according to an embodiment of the present invention, and FIG. 1B isa plane view thereof taken along an arrow direction of FIG. 1A.

Referring to FIG. 1A, the flash lens 100 of the current embodiment mayinclude a lens unit including first and second incident surfaces 120 and110, a reflecting surface 130, and light-emitting surface 140, and alens seating portion 150 disposed at a lower portion of an edge of thelight-emitting surface 140, extending and protruding from the reflectingsurface 130, and including a pattern 160 formed in a lower surfacethereof.

The lens unit may include the first and second incident surfaces 120 and110 on which light emitted from a light-emitting device formed at alower portion of the flash lens 100 is incident. The incident surfacesmay include the first incident surface 120 on which light is incident ina center direction of the flash lens 100 from the light-emitting device,and the second incident surface 110 on which light is incident in alateral direction of the flash lens 100 from the light-emitting device.However, the incident surfaces are not limited thereto, and any ofvarious incident surfaces may be used.

The lens unit may also include the reflecting surface 130 for reflectinglight incident on the second incident surface 110 toward thelight-emitting surface 140. The reflecting surface 130 may reflect lightincident on the second incident surface 110 in a lateral direction ofthe flash lens 100 from a light-emitting device chip to emit the lightto the light-emitting surface 140. Also, the reflecting surface 130 mayreflect light reflected at the first incident surface 120, and incidenton the second incident surface 110 toward the light-emitting surface140. Meanwhile, the reflecting surface 130 may totally reflect lighttoward the light-emitting surface 140.

In addition, the lens unit may include the light-emitting surface 140.The light-emitting surface 140 may emit light incident on the first andsecond incident surfaces 120 and 110 of the lens unit out of the flashlens 100. That is, the light-emitting surface 140 may emit lightincident on the first incident surface 120 and light incident on thesecond incident surface 110 and reflected at the reflecting surface 130out of the flash lens 100. Also, the light-emitting surface 140 may emitlight reflected at the first incident surface 120, and incident on thesecond incident surface 110, and reflected at the reflecting surface 130out of the flash lens 100.

The lens seating portion 150 may be disposed at the lower portion of theedge of the light-emitting surface 140, and may extend and protrude fromthe reflecting surface 130. The pattern 160 may be formed in the lowersurface of the lens seating portion 150 and may reflect light incidenton the lens seating portion 150 toward the light-emitting surface 140.In a conventional flash lens formed of a silicon resin and not having aframe, the silicon resin has a low hardness, and thus the conventionalflash lens requires a thick lens seating portion, for example, a lensseating portion having a thickness of about 0.3 mm. The lens seatingportion functions as a light guide plate, and thus, light is lostthrough the lens seating portion. However, the flash lens 100 of thecurrent embodiment may reflect light incident on the lens seatingportion 150 at the pattern 160 formed in the lower surface thereoftoward the light-emitting surface 140, thereby preventing light frombeing lost in the lens seating portion 150 and increasing illuminance ofa peripheral portion of the flash lens 100 compared to a center portionof the flash lens 100.

The pattern 160 may have a plurality of basic shapes formed repeatedly.As illustrated in FIG. 1A, a cross section of a basic shape has anequilateral triangle, such as a prism, but the present invention is notlimited thereto, and the basic shape may have any of various shapes.That is, the cross section of the basic shape for forming the pattern160 may have a polygonal shape, such as a triangle, a quadrangle, or thelike, but may have a semicircular shape, a sine wave shape, or the like.Also, the pattern 160 may have a plurality of basic shapes having thesame size. That is, the cross section of the pattern 160 may have ashape in which triangles having the same size are regularly arranged.Also, the flash lens 100 of the current embodiment may be formed of asilicon resin, and thus, may have a higher degree of precision than aplastic lens.

Referring to FIG. 1B, the lens unit has a circular shape. That is, thefirst incident surface 120, the light-emitting surface 140, and the likemay be formed in a circular shape. However, the present invention is notlimited thereto. In addition, the lens seating portion 150, in the viewtaken along the arrow direction illustrated in FIG. 1A, has a circularshape, but the present invention is not limited thereto, and the lensseating portion 150 may have any of various shapes. A plane of thepattern 160 may have a shape in which a plurality of concentric circlesare regularly arranged, that is, a shape in which a plurality of circlesare arranged around the lens unit so as to become larger at apredetermined ratio.

FIG. 2A is a schematic cross-sectional view illustrating a flash lens200 according to another embodiment of the present invention, and FIG.2B is a plane view thereof taken along an arrow direction of FIG. 2A.Hereinafter, differences between the flash lens 100 of FIGS. 1A and 1Band the flash lens 200 of FIGS. 2A and 2B will be mainly described.

Referring to FIG. 2A, the flash lens 200 of the current embodiment mayinclude a lens unit including first and second incident surfaces 220 and210, a reflecting surface 230, and a light-emitting surface 240, and alens seating portion 250 disposed at a lower portion of an edge of thelight-emitting surface 240, extending and protruding from the reflectingsurface 230, and including a pattern 260 formed in a lower surfacethereof. The first and second incident surfaces 220 and 210, thereflecting surface 230, and the light-emitting surface 240 included inthe lens unit respectively are as those described in the embodiment withregard to FIGS. 1A and 1B.

The lens seating portion 250 may be disposed at the lower portion of theedge of the light-emitting surface 240, and may extend and protrude fromthe reflecting surface 230. The pattern 260 may be formed in the lowersurface of the lens seating portion 250 and may reflect light incidenton the lens seating portion 250 toward the light-emitting surface 240,thereby preventing light from being lost in a conventional lens seatingportion of a flash lens not having a frame and increasing illuminance ofa peripheral portion of the flash lens 200 compared to a center portionof the flash lens 200.

The pattern 260 may have a plurality of basic shapes formed repeatedly.As illustrated in FIG. 2A, a cross section of a basic shape has asemicircular shape, but the present invention is not limited thereto,and the basic shape may have any of various shapes. That is, the crosssection of the basic shape for forming the pattern 260 may have apolygonal shape, such as a triangle, a quadrangle, or the like, but mayhave a curve shape, such as a semicircular shape, a sine wave shape, orthe like. Also, the pattern 260 may be formed of a plurality of basicshapes having the same size. That is, the cross section of the pattern260 may have a shape in which semicircular shapes having the same sizeare regularly arranged.

Referring to FIG. 2B, the lens unit has a circular shape. That is, thefirst incident surface 220, the light-emitting surface 240, and the likemay be formed in a circular shape. However, the present invention is notlimited thereto. In addition, the lens seating portion 250, in the viewtaken along the arrow direction illustrated in FIG. 2A, has a squareshape, but the present invention is not limited thereto, and the lensseating portion 250 may have a quadrangle shape, such as a rectangularshape, a polygonal shape, a circular shape, an oval shape, or the like.A plane of the pattern 260 formed in the lens seating portion 250 mayhave a shape in which a plurality of concentric circles are regularlyarranged, that is, a shape in which a plurality of circles are arrangedaround the lens unit so as to become larger at a predetermined ratio.

In addition, in the lens seating portion 250 having a square shape asillustrated in FIG. 2B, the pattern 260 may have a shape in which aplurality of arcs, as parts of cut-off concentric circles, are regularlyarranged.

FIG. 3A is a schematic cross-sectional view illustrating a flash lens300, according to another embodiment of the present invention, and FIG.3B is a plane view thereof taken along an arrow direction of FIG. 3A.Hereinafter, differences between the flash lens 300 of FIGS. 3A and 3Band the flash lens 100 and 200 will be mainly described.

Referring to FIG. 3A, the flash lens 300 of the current embodiment mayinclude a lens unit including first and second incident surfaces 320 and310, a reflecting surface 330, and a light-emitting surface 340, and alens seating portion 350 disposed at a lower portion of an edge of thelight-emitting surface 340, extending and protruding from the reflectingsurface 330, and including a pattern 360 formed in a lower surfacethereof. The first and second incident surfaces 320 and 310, thereflecting surface 330, and the light-emitting surface 340 included inthe lens unit are respectively as those described in the embodiment withregard to FIGS. 1A and 1B.

The lens seating portion 350 may be disposed at the lower portion of theedge of the light-emitting surface 340, and may extend and protrude fromthe reflecting surface 330. The pattern 360 may be formed in the lowersurface of the lens seating portion 350 and may reflect light incidenton the lens seating portion 350 toward the light-emitting surface 340,thereby preventing light from being lost in a conventional lens seatingportion of a flash lens not having a frame and increasing illuminance ofa peripheral portion of the flash lens 300 compared to a center portionof the flash lens 300. The pattern 360 may have a plurality of basicshapes formed repeatedly. As illustrated in FIG. 3A, a cross section ofthe basic shape has a triangular shape, but the present invention is notlimited thereto, and the basic shape may have any of various shapes.That is, the cross section of the basic shape for forming the pattern360 may have a polygonal shape, such as a triangle, a quadrangle, or thelike, but may have a curve shape, such as a semicircular shape, a sinewave shape, or the like.

Unlike FIGS. 1A, 1B, 2A, and 2B as described above, the plurality ofbasic shapes do not have the same size, and as illustrated in FIG. 3A,as the distance between the basic shape and the reflecting surface 330increases, the basic shape may become larger. That is, a cross sectionof the lens seating portion 350 may have a shape in which trianglesregularly arranged become larger outward. Unlike FIG. 3A, as thedistance between the basic shape and the reflecting surface 330increases, the cross section of the basic shape may be smaller.

Referring to FIG. 3B, the lens unit has a rectangular shape. That is,the first incident surface 320, the light-emitting surface 340, and thelike may be formed in a rectangular shape. However, the presentinvention is not limited thereto. In addition, the lens seating portion350, in the view taken along the arrow direction illustrated in FIG. 3A,may have a rectangular shape, but the present invention is not limitedthereto, and the lens seating portion 350 may have any of various forms.A plane of the pattern 360 formed in the lens seating portion 350 mayhave a shape in which a plurality of rectangles are arranged around thelens unit, wherein as the distance between the lens unit and the pattern360 increases, a rectangle becomes larger. That is, as the distancebetween the lens unit and the pattern 360 increases, an interval betweenthe patterns 360 may be increased. Also, diagonals formed in the lensseating portion 350 having a rectangular shape may have a shape in whichjunctions of horizontal basic shapes and vertical basic shapes are bent.The diagonals may be shown as single lines in FIG. 3B.

FIG. 4A is a schematic cross-sectional view illustrating a flash lens400, according to another embodiment of the present invention, and FIG.4B is a plane view thereof taken along an arrow direction of FIG. 4A.Hereinafter, differences between the flash lens 400 of FIGS. 4A and 4Band the flash lens 100, 200, and 300 will be mainly described.

Referring to FIG. 4A, the flash lens 400 of the current embodiment mayinclude a lens unit including first and second incident surfaces 420 and410, a reflecting surface 430, and a light-emitting surface 440, and alens seating portion 450 disposed at a lower portion of an edge of thelight-emitting surface 440, extending and protruding from the reflectingsurface 430, and including a pattern 460 formed in a lower surfacethereof. The first and second incident surfaces 420 and 410, thereflecting surface 430, and the light-emitting surface 440 included inthe lens unit are respectively as those described in the embodiment withregard to FIGS. 1A and 1B.

The lens seating portion 450 may be disposed at the lower portion of theedge of the light-emitting surface 440, and may extend and protrude fromthe reflecting surface 430. The pattern 460 may be formed in the lowersurface of the lens seating portion 450 and may reflect light incidenton the lens seating portion 450 toward the light-emitting surface 440,thereby preventing light from being lost in a conventional lens seatingportion of a flash lens not having a frame and increasing illuminance ofa peripheral portion of the flash lens 400 compared to a center portionof the flash lens 400.

The pattern 460 may be formed by repeatedly forming a plurality of basicshapes. As illustrated in FIG. 4A, a cross section of a basic shape hasa semicircular shape, but the present invention is not limited thereto,and the basic shape may have any of various shapes. That is, the crosssection of the basic shape for forming the pattern 460 may have apolygonal shape, such as a triangle, a quadrangle, or the like, but mayhave a semicircular shape, a sine wave shape, or the like. In addition,as illustrated in FIG. 4A, as the distance between the basic shape andthe reflecting surface 430 increases, the basic shape may become larger.That is, a cross section of the lens seating portion 450 may have ashape in which semicircles regularly arranged become larger outward.Also, unlike FIG. 4A, as the distance between the basic form and thereflecting surface 430 increases, the cross section of the basic shapemay be smaller.

Referring to FIG. 4B, the lens unit has a rectangular shape. That is,the first incident surface 420, the light-emitting surface 440, and thelike may be formed in a rectangular shape. However, the presentinvention is not limited thereto. In addition, the lens seating portion450, in the view taken along the arrow direction illustrated in FIG. 4A,may have an oval shape, but the present invention is not limitedthereto, and the lens seating portion 450 may have any of various forms.A plane of the pattern 460 formed in the lens seating portion 450 mayhave a shape in which a plurality of ovals are arranged around the lensunit, wherein as the distance between the lens unit and the pattern 460increases, the oval becomes larger. That is, as the distance between thelens unit and the pattern 460 increases, the flash lens 400 may have ashape a plurality of ovals having an increasingly long axis and anincreasingly short axis are regularly arranged. Also, a part of thepattern 460 adjacent to the lens unit may be omitted due to the lensunit.

FIGS. 5A and 5B are charts illustrating illuminance of the flash lens100 according to an embodiment of the present invention. FIG. 5Aillustrates illuminance of the flash lens 100 in an x-y plane about onemeter away from the flash lens 100, and FIG. 5B illustrates distributionof the illuminance of the flash lens 100 illustrated in FIG. 5A. Thatis, FIG. 5B illustrates ratios of each illuminances shown in FIG. 5A andthe ratios are determined by dividing the region illustrated in FIG. 5Ainto a plurality of cells, counting a number of cells having a specificilluminance, and calculating each ratio of the number of cells havingthe specific illuminance to the number of total cells. Colorscorresponding 32 illuminances of the light emitted by the flash lens 100are illustrated on the left side in FIG. 5B, and distribution of theilluminances of light emitted through the flash lens 100 is illustratedon the right side of FIG. 5B. Referring to FIGS. 5A and 5B, illuminanceuniformity of the flash lens 100 of the current embodiment is about68.5%. Accordingly, it is seen that the illuminance uniformity of theflash lens 100 of the current embodiment is increased by about 3.5%,compared to illuminance uniformity of about 65% of a conventional lensseating portion not including a pattern. In this regard, the illuminanceuniformity refers to a ratio of illuminance of a peripheral portion withrespect to illuminance of a center portion at a position about one meteraway from a flash lens. A low illuminance uniformity means thatilluminance of a peripheral portion is low compared to that of a centerportion, and during photographing, an edge portion of an image mayappear dark. Accordingly, in order for the overall brightness of animage to appear similarly, illuminance uniformity of a flash moduleneeds to be high. In the flash lens 100 of the current embodiment,illuminance uniformity is increased compared to a conventional flashlens, and thus, uniform flash light may be provided to a peripheralregion outside a region corresponding to a center region of the flashlens during photographing. The flash lenses 200, 300, and 400 accordingto the other embodiments may also realize increased illuminanceuniformity, compared to a conventional flash lens, as the illuminanceuniformity illustrated in FIGS. 5A and 5B.

FIG. 6 is a schematic cross-sectional view illustrating a flash module50 according to an embodiment of the present invention.

Referring to FIG. 6, the flash module 50 of the current embodiment mayinclude a light emitting diode (LED) chip 20, a housing 10 on which theLED chip 20 is disposed, and the flash lens 100 seated on the housing10. The flash module 50 may further include a phosphor layer 30 betweenthe LED chip 20 and the flash lens 100, and may include the flash lenses200, 300, and 400 according to the other embodiments.

In the flash module 50 of the current embodiment, the pattern 160 isformed in the lower surface of the lens seating portion 150. The pattern160 may reflect light incident on the lens seating portion 150 towardthe light-emitting surface 140 so as to prevent light from being lost inthe lens seating portion 150. Therefore, illuminance uniformity, whichrefers to a ratio of illuminance of a peripheral portion of the flashmodule 50 with respect to illuminance of a center portion of the flashmodule 50, may be increased compared to a conventional flash moduleincluding a lens seating portion not having a pattern.

In addition, the flash module 50 may be integrally formed with the flashlens 100 so as to reduce change in illuminance of light due to anassembly tolerance. That is, the flash module 50 may be manufactured byusing the following method. First, a pattern corresponding to thepattern 160 of the lens seating portion 150 is formed in a lower framein which a plurality of the housings 10 are installed each on which theLED chip 20 is mounted, and then a silicon resin is injected into thepattern. Then, an upper frame is coupled to the lower frame, and thesilicon resin is hardened, and thus, the flash lens 100 may beintegrally formed on the housing 10. Also, the flash lens 100 may beformed by insert-molding silicon having a low hardness without using aframe, thereby reducing a manufacturing cost of the frame andsimplifying a manufacturing process.

It should be understood that the exemplary embodiments described thereinshould be considered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments.

What is claimed is:
 1. A flash lens comprising: a lens unit comprisingan incident surface, a reflecting surface, and a light-emitting surface;and a lens seating portion disposed at a lower portion of an edge of thelight-emitting surface, extending and protruding outwardly from thereflecting surface, and including a pattern formed in a lower surfacethereof.
 2. The flash lens of claim 1, wherein the pattern has aplurality of basic shapes repeatedly formed.
 3. The flash lens of claim1, wherein the pattern reflects light incident on the lens seatingportion toward the light-emitting surface.
 4. The flash lens of claim 1,wherein the lens seating portion has any one shape selected from thegroup consisting of a rectangular shape, a square shape, a circularshape, and an oval shape.
 5. The flash lens of claim 1, wherein a crosssection of the basic shape has any one shape selected from the groupconsisting of a triangular shape and a semicircular shape.
 6. The flashlens of claim 1, wherein the plurality of basic shapes have the samesize.
 7. The flash lens of claim 1, wherein as the distance between thebasic shape and the reflecting surface increases, the basic shapebecomes larger.
 8. A flash module comprising: the flash lens of claim 1;and a light emitting diode (LED) chip integrally formed with the flashlens.
 9. The flash lens of claim 1, wherein the lens seating portion isarranged on an outermost peripheral portion of the lens unit.
 10. Theflash lens of claim 1, wherein the lens seating portion is arranged soas to at least partially surround an outer peripheral portion of thelens unit.
 11. The flash lens of claim 1, wherein an upper surface ofthe lens seating portion is coplanar with the light-emitting surface.12. The flash lens of claim 1, wherein the incident surface comprises afirst incident surface that is parallel with the light-emitting surfaceand a second incident surface that is not parallel with thelight-emitting surface.
 13. The flash lens of claim 12, wherein thelevel of the lower surface of the lens seating portion is located to behigher than the level of the first incident surface.
 14. The flash lensof claim 12, wherein the second incident surface is substantiallyvertical to the light-emitting surface.